Hello, I have a client that purchased a painting business this year with a large job currently in progress. There were never pre approved signed change orders however since July my client (subcontractor) has completed $200k in work in change orders. They are refusing to make payment without material invoices with the amount and our costs directly from our supplier. Obviously then exposing intellectual capital and now also is demanding these for all change orders by end of business day today or “they will not be paid and we will not discuss these again” What can we do? They are charging chargebacks on everything they can and now refusing to pay on any of the 32 outstanding change orders on this job.